The number of installs doesn't provide a completely accurate
comparison, since it's unclear whether or not those people
actually ended up using the service. But, it does provide some
perspective as to how many consumers were interested in Google
Wallet.

Although Apple seems to have convinced a decent number of users
to sign up for Apple Pay relatively quickly, some retailers are
refusing to adopt the system. Rite Aid and CVS are among these
merchants, and it's unclear exactly why they're blocking
customers from using Apple's new payment service. Some have
speculated it's because of the Merchant Customer Exchange, a
consortium of the largest retailers in the US, which happens to
be testing its own mobile payments service.

This, however, doesn't worry Cook, as he said on stage
that "over the long arc of time," retailers will have to do
what consumers want. Basically, it sounds like he's saying that
if Apple Pay becomes massively popular, retailers will adopt it
in due time.